[He suddenly grits his teeth, like he's about to say something painful in response to that, but he stops himself short. No, snapping won't do any good here. Even as he feels that pain welling up inside his chest.]

Don't- they already leave a hole, Saki. A big, person-shaped hole that will never be filled, no matter how many tears you cry or how much you try to fill yourself with other things. Regardless of if you know their name or not, that hole is still there.

[Why did he leave?

Why didn't he chase after him when he had the chance?]